Treated Timber Joist 47 x 200mm C24 (8x2)

Treated Timber Joist 47 x 200mm C24

Treated Timber Joist 47 x 200mm C24 (8x2) is a useful choice when selecting timber material for trade or DIY work, with our extensive timber wood range offering further options for related construction, joinery, and finishing requirements. Treated Timber Joists offer a strong, dependable, and versatile solution for a wide range of structural construction projects. Often referred to as softwood carcassing timber, these joists are strength-graded to C24, ensuring superior load-bearing capacity and performance for demanding building applications. Each timber joist is pressure treated to improve resistance against moisture and fungal decay, making it suitable for above-ground use where there is an occasional risk of wetting. The wood is planed and regularised, giving it a smooth, uniform surface with eased edges for easier handling and a cleaner finish during installation. The joists are also kiln-dried, reducing moisture content to a stable level to enhance durability, minimise warping, and improve overall strength. Available in a range of lengths from 3.0m to 6.0m, this C24 timber is ideal for use in flooring, roofing, wall framing, and general carcassing. Responsibly sourced and PEFC 70% certified, these treated joists are not only built to last but also produced with sustainability in mind — making them the go-to choice for professional builders and DIY users alike.

Key Specifications

• Section Size: 47 x 200mm
• Finished Size (Approx.): 45 x 195mm
• Lengths Available: 3.0m, 3.6m, 4.2m, 4.8m, 6.0m
• Grade: C24 (Structural)
• Treatment: Pressure Treated for durability
• Finish: Planed and Regularised with Eased Edges
• Moisture Content: Kiln Dried for stability
• Certification: 70% PEFC Certified

FAQs

What does C24 mean in timber grading?

C24 is a premium structural grade that signifies superior strength and quality. It can withstand higher loads and is commonly used in applications like flooring, roofing, and framework construction where strength and consistency are essential.

Can C24 treated timber be used outside?

Yes, this timber is suitable for exterior use in areas that may experience occasional wetting, such as outdoor framing or decking structures. However, it should not be used in direct ground contact unless specifically rated for that purpose.

Why is kiln drying beneficial for treated timber?

Kiln drying reduces the timber’s moisture content, improving its dimensional stability and resistance to twisting or cracking. It also helps the treatment penetrate more effectively, ensuring longer-lasting protection and structural integrity.

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As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

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Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.

Multiple Products from the Same Supplier

If you're ordering multiple products from the same supplier, your order will be dispatched together once all items are ready. This means the longest lead time will apply.

If you need part of your order sooner, please call us on 01202 113233. We can arrange a split delivery, although an additional shipping charge will apply.